The correct answer is letter D.
Explanation: A nation-state is a historical area that can be identified as having a legitimate policy, which by its own means constitutes a sovereign government. While a state is a political and geopolitical entity, a nation is an ethnic and cultural unit.
The word empire means a large territory, contiguous or not, composed of several different nations, and which is dominated by a nation that imposes its will on others economically and militarily. The supreme leader of an empire is called the emperor.
Answer:
<em>D) Advances in education and human services</em>
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<u><em>Please mark brainliest!</em></u>
<u><em>Hope this helps!:</em></u>
The main sources that cause air pollution today are things like: Gasses from vehicles, toxic chemicals, smoke from factories, pet hair, and Randon. (Randon is a colorless and odorless gas that is radioactive).
All those things cause: Air pollution, acid rain, and ozone. (Ozone is a toxic form of oxygen).
I know all this because I just learned it and wrote an essay on it yesterday.
Hope I helped!
- Amber
